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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026939561a67ce7fe72d3a04674dda3d56bf7e62e53a03215cfa0cf328c16e87' 
  AND token = 'qmwCeQMO47CQGwlxVz608jdaktGB5tJPF5a+9MC5n/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}